Why was my HCMC DTV Workcation application rejected without any reasons?

HCMC DTV Workcation rejected, no reasons given.

Provided the following;

1. Cover letter from my manager stating my work and what I do, signed

2. Employment Contract, showing remote work, signed

3. Employment Offer Letter, signed

4. 11 Months Payslips

5. End of year tax return

5. Passport showing all entries into and out of Thailand and entry into Ho Chi Minh City

6. Booking confirmation for the hotel I am staying at in Ho Chi Minh City.

7. Passport Photograph

8. Document stating purpose of visit

9. Official HMRC doc showing Company Name change

10. Official HMRC doc showing Company registration and incorporation

11. 6 Month bank statement showing sufficient funds (Although this is not the account I receive my salary in, this is my savings account)

12. Every page of passport including all entries in and out of Thailand (No Visa overstay, I've only been to Thailand twice and I left a few days before the end date of the Visa on both occasions)

13. Completed New Employee Data Form

14. Cover letter explaining my work, my companies' work (stating that we do not have any clients outside of the UK due to regulations) and explaining how I carry out my job

15. DMK -> HCMC Outbound flight confirmation and booking

16. HCMC Hotel booking confirmation and booking

Addition docs requested were for pictures of me at tourist attractions, main bank account where I was being paid, booking confirmations and passport pages. Provided everything requested, no missing or incorrect information and application was rejected just now with no reasoning as to why.

This is extremely disappointing especially after waiting so long

I'm currently considering travelling to Los Angeles as I've heard people have had better luck and quicker processing there, anyone have any thoughts on this?